Where is it? Can it be measured? Replicated? Created? Marcus du Sautoy puzzles the problem of consciousness.

Brain imagining techniques have shown that our minds work differently when we’re asleep compared to when we’re awake, conscious vs. unconscious. Integrated information theory attempts to measure how conscious a system is using mathematical formulae. Could maths answer the question about what consciousness is or do we need to look to philosophy?

This animation was produced by Diana Gradinaru for The Royal Institution of Great Britain